65681073 has 6 divisors (see below), whose sum is σ = 94872674. Its totient is φ = 43787376.

The previous prime is 65681071. The next prime is 65681113. The reversal of 65681073 is 37018656.

It can be written as a sum of positive squares in only one way, i.e., 54066609 + 11614464 = 7353^2 + 3408^2 .

It is not a de Polignac number, because 65681073 - 2¹ = 65681071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65681071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3648940 + ... + 3648957.

Almost surely, 2^65681073 is an apocalyptic number.

It is an amenable number.

65681073 is a deficient number, since it is larger than the sum of its proper divisors (29191601).

65681073 is a wasteful number, since it uses less digits than its factorization.

65681073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7297903 (or 7297900 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 65681073 is about 8104.3860347345. The cubic root of 65681073 is about 403.4720110674.

The spelling of 65681073 in words is "sixty-five million, six hundred eighty-one thousand, seventy-three".